中国物理B ›› 2023, Vol. 32 ›› Issue (4): 47505-047505.doi: 10.1088/1674-1056/acb9e8

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Strong spin frustration and magnetism in kagomé antiferromagnets LnCu3(OH)6Br3 (Ln=Nd, Sm, and Eu)

Jin-Qun Zhong(钟金群)1, Zhen-Wei Yu(余振伟)1, Xiao-Yu Yue(岳小宇)5, Yi-Yan Wang(王义炎)2, Hui Liang(梁慧)2, Yan Sun(孙燕)2, Dan-Dan Wu(吴丹丹)2, Zong-Ling Ding(丁宗玲)4, Jin Sun(孙进)4, Xue-Feng Sun(孙学峰)3,‡, and Qiu-Ju Li(李秋菊)4,†   

  1. 1 School of Materials Science and Engineering, Anhui University, Hefei 230601, China;
    2 Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China;
    3 Department of Physics, and Key Laboratory of Strongly-Coupled Quantum Matter Physics(CAS), University of Science and Technology of China, Hefei 230026, China;
    4 School of Physics and Optoelectronic engineering, Anhui University, Hefei 230601, China;
    5 School of Optical and Electronic Information, Suzhou City University, Suzhou 215104, China
  • 收稿日期:2023-01-09 修回日期:2023-02-03 接受日期:2023-02-08 出版日期:2023-03-10 发布日期:2023-03-23
  • 通讯作者: Qiu-Ju Li, Xue-Feng Sun E-mail:liqj@ahu.edu.cn;xfsun@ustc.edu.cn
  • 基金资助:
    Project supported by the Natural Science Foundation of Anhui Province, China (Grant Nos. 2108085MA16 and 2108085QA22), the Key Project of Anhui Provincial Department of Education (Grant No. KJ2020A0013), the Key Project of the Foundation of Anhui Education Committee, China (Grant No. 2022AH050066), and the National Natural Science Foundation of China (Grant Nos. U1832209, 11874336, 12274338, 12104010, 12104011, 52102333, and 12004003).

Strong spin frustration and magnetism in kagomé antiferromagnets LnCu3(OH)6Br3 (Ln=Nd, Sm, and Eu)

Jin-Qun Zhong(钟金群)1, Zhen-Wei Yu(余振伟)1, Xiao-Yu Yue(岳小宇)5, Yi-Yan Wang(王义炎)2, Hui Liang(梁慧)2, Yan Sun(孙燕)2, Dan-Dan Wu(吴丹丹)2, Zong-Ling Ding(丁宗玲)4, Jin Sun(孙进)4, Xue-Feng Sun(孙学峰)3,‡, and Qiu-Ju Li(李秋菊)4,†   

  1. 1 School of Materials Science and Engineering, Anhui University, Hefei 230601, China;
    2 Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China;
    3 Department of Physics, and Key Laboratory of Strongly-Coupled Quantum Matter Physics(CAS), University of Science and Technology of China, Hefei 230026, China;
    4 School of Physics and Optoelectronic engineering, Anhui University, Hefei 230601, China;
    5 School of Optical and Electronic Information, Suzhou City University, Suzhou 215104, China
  • Received:2023-01-09 Revised:2023-02-03 Accepted:2023-02-08 Online:2023-03-10 Published:2023-03-23
  • Contact: Qiu-Ju Li, Xue-Feng Sun E-mail:liqj@ahu.edu.cn;xfsun@ustc.edu.cn
  • Supported by:
    Project supported by the Natural Science Foundation of Anhui Province, China (Grant Nos. 2108085MA16 and 2108085QA22), the Key Project of Anhui Provincial Department of Education (Grant No. KJ2020A0013), the Key Project of the Foundation of Anhui Education Committee, China (Grant No. 2022AH050066), and the National Natural Science Foundation of China (Grant Nos. U1832209, 11874336, 12274338, 12104010, 12104011, 52102333, and 12004003).

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摘要： To study the effects of lanthanide ions on the geometrically frustrated antiferromagnets and their magnetic properties, we grew high-quality single crystals of $Ln$Cu$_{3}$(OH)$_{6}$Br$_{3}$ ($Ln={\rm Nd}$, Sm, and Eu) by hydrothermal method and studied their crystal structures and magnetic properties. The refinements of the crystal structure referred to the powder x-ray diffraction data show that $Ln$Cu$_{3}$(OH)$_{6}$Br$_{3}$ adopt a Kapellasite-type layer structure, which is isostructural to their chlorine analogue. Magnetic susceptibilities demonstrate that $Ln$Cu$_{3}$(OH)$_{6}$Br$_{3}$ have strong antiferromagnetic coupling and a pronounced magnetic frustration effect. Magnetization measurements indicate canted antiferromagnetic ordering of Cu$^{2+}$ ions around 16 K within the kagomé plane and weak ferromagnetic coupling. Moreover, shoulder-like anomalies in specific heat around 16 K could be a signature of emergent of magnetic ordering. The low-temperature negative magnetization and specific heat of $Ln$Cu$_{3}$(OH)$_{6}$Br$_{3}$ ($Ln={\rm Nd}$, Sm, and Eu) indicate that $Ln^{3+}$ ions induce more exotic magnetic ground state properties.

关键词: kagomé, lattice, antiferromagnet, single crystal, spin frustration

Abstract: To study the effects of lanthanide ions on the geometrically frustrated antiferromagnets and their magnetic properties, we grew high-quality single crystals of $Ln$Cu$_{3}$(OH)$_{6}$Br$_{3}$ ($Ln={\rm Nd}$, Sm, and Eu) by hydrothermal method and studied their crystal structures and magnetic properties. The refinements of the crystal structure referred to the powder x-ray diffraction data show that $Ln$Cu$_{3}$(OH)$_{6}$Br$_{3}$ adopt a Kapellasite-type layer structure, which is isostructural to their chlorine analogue. Magnetic susceptibilities demonstrate that $Ln$Cu$_{3}$(OH)$_{6}$Br$_{3}$ have strong antiferromagnetic coupling and a pronounced magnetic frustration effect. Magnetization measurements indicate canted antiferromagnetic ordering of Cu$^{2+}$ ions around 16 K within the kagomé plane and weak ferromagnetic coupling. Moreover, shoulder-like anomalies in specific heat around 16 K could be a signature of emergent of magnetic ordering. The low-temperature negative magnetization and specific heat of $Ln$Cu$_{3}$(OH)$_{6}$Br$_{3}$ ($Ln={\rm Nd}$, Sm, and Eu) indicate that $Ln^{3+}$ ions induce more exotic magnetic ground state properties.

Key words: kagomé, lattice, antiferromagnet, single crystal, spin frustration

中图分类号:  (Quantized spin models, including quantum spin frustration)

  • 75.10.Jm
75.40.Cx (Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)) 06.60.Ei (Sample preparation) 61.05.cp (X-ray diffraction)